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Message-Id: <20081009190406.1B257119@kernel>
Date: Thu, 09 Oct 2008 12:04:06 -0700
From: Dave Hansen <dave@...ux.vnet.ibm.com>
To: Oren Laadan <orenl@...columbia.edu>
Cc: arnd@...db.de, containers@...ts.linux-foundation.org,
linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
Dave Hansen <dave@...ux.vnet.ibm.com>
Subject: [RFC][PATCH 2/2] first callers of process_deny_checkpoint()
These are just a few simple examples of things we know we can't
checkpoint now. There are plenty more, but this should give
everyone an idea how this will look in practice.
Signed-off-by: Dave Hansen <dave@...ux.vnet.ibm.com>
---
linux-2.6.git-dave/fs/aio.c | 7 +++++++
linux-2.6.git-dave/ipc/mqueue.c | 3 +++
linux-2.6.git-dave/net/socket.c | 5 +++++
3 files changed, 15 insertions(+)
diff -puN fs/aio.c~no-checkpointing-for-sockets fs/aio.c
--- linux-2.6.git/fs/aio.c~no-checkpointing-for-sockets 2008-10-09 11:56:58.000000000 -0700
+++ linux-2.6.git-dave/fs/aio.c 2008-10-09 11:56:58.000000000 -0700
@@ -19,6 +19,7 @@
#define DEBUG 0
+#include <linux/checkpoint.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/file.h>
@@ -1663,6 +1664,8 @@ asmlinkage long sys_io_submit(aio_contex
if (unlikely(!access_ok(VERIFY_READ, iocbpp, (nr*sizeof(*iocbpp)))))
return -EFAULT;
+ process_deny_checkpointing(current);
+
ctx = lookup_ioctx(ctx_id);
if (unlikely(!ctx)) {
pr_debug("EINVAL: io_submit: invalid context id\n");
@@ -1742,6 +1745,8 @@ asmlinkage long sys_io_cancel(aio_contex
if (unlikely(!ctx))
return -EINVAL;
+ process_deny_checkpointing(current);
+
spin_lock_irq(&ctx->ctx_lock);
ret = -EAGAIN;
kiocb = lookup_kiocb(ctx, iocb, key);
@@ -1796,6 +1801,8 @@ asmlinkage long sys_io_getevents(aio_con
struct kioctx *ioctx = lookup_ioctx(ctx_id);
long ret = -EINVAL;
+ process_deny_checkpointing(current);
+
if (likely(ioctx)) {
if (likely(min_nr <= nr && min_nr >= 0 && nr >= 0))
ret = read_events(ioctx, min_nr, nr, events, timeout);
diff -puN ipc/mqueue.c~no-checkpointing-for-sockets ipc/mqueue.c
--- linux-2.6.git/ipc/mqueue.c~no-checkpointing-for-sockets 2008-10-09 11:56:58.000000000 -0700
+++ linux-2.6.git-dave/ipc/mqueue.c 2008-10-09 11:56:58.000000000 -0700
@@ -14,6 +14,7 @@
*/
#include <linux/capability.h>
+#include <linux/checkpoint.h>
#include <linux/init.h>
#include <linux/pagemap.h>
#include <linux/file.h>
@@ -655,6 +656,8 @@ asmlinkage long sys_mq_open(const char _
char *name;
int fd, error;
+ process_deny_checkpointing(current);
+
error = audit_mq_open(oflag, mode, u_attr);
if (error != 0)
return error;
diff -puN net/socket.c~no-checkpointing-for-sockets net/socket.c
--- linux-2.6.git/net/socket.c~no-checkpointing-for-sockets 2008-10-09 11:56:58.000000000 -0700
+++ linux-2.6.git-dave/net/socket.c 2008-10-09 11:56:58.000000000 -0700
@@ -87,6 +87,7 @@
#include <linux/audit.h>
#include <linux/wireless.h>
#include <linux/nsproxy.h>
+#include <linux/checkpoint.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>
@@ -1236,6 +1237,8 @@ asmlinkage long sys_socket(int family, i
if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
+ process_deny_checkpointing(current);
+
retval = sock_create(family, type, protocol, &sock);
if (retval < 0)
goto out;
@@ -2130,6 +2133,8 @@ asmlinkage long sys_socketcall(int call,
a0 = a[0];
a1 = a[1];
+ process_deny_checkpointing(current);
+
switch (call) {
case SYS_SOCKET:
err = sys_socket(a0, a1, a[2]);
_
--
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